Effects of water in organic solvents on the synergistic extraction of zinc(II) with pivaloyltrifluoroacetone and 1,10-phenanthroline.

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  • MATSUBAYASHI Izuru
    Department of Chemistry, Faculty of Science, Science University of Tokyo
  • INAGAKI Akiko
    Department of Chemistry, Faculty of Science, Science University of Tokyo
  • HASEGAWA Yuko
    Department of Chemistry, Faculty of Science, Science University of Tokyo

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Other Title
  • ピバロイルトリフルオロアセトンと１，１０‐フェナントロリンによる亜鉛（ＩＩ）の協同抽出の大きさに与える有機溶媒中の水の影響
  • ピバロイルトリフルオロアセトンと1,10-フェナントロリンによる亜鉛(II)の協同抽出の大きさに与える有機溶媒中の水の影響
  • ピバロイルトリフルオロアセトン ト 1 10 フェナントロリン ニ ヨル アエン II ノ キョウドウ チュウシュツ ノ オオキサ ニ アタエル ユウキ ヨウバイ チュウ ノ ミズ ノ エイキョウ

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Abstract

From the extraction data of zinc (II) with pivaloyltrifluoroacetone (1,1,1-trifluoro-5,5-dimethyl-2,4-hexanedion, PTA) and/or 1,10-phenanthroline (phen), the formation constants of Zn(PTA)2 adduct with phen (β1=[Zn(PTA)2 · phen]o[Zn(PTA)2]o-1[phen]o-1) were determined in chloroform, carbon tetrachloride, and hexane. When the adduct formation constants were plotted against the concentration of water saturated into the organic solvents, a straight line having a slope of -2 was obtained. This suggests that the equilibrium of the adduct formation can be described as<br>Zn(PTA)2 · 2H2O(o)+phen(o)→←Zn(PTA)2 · phen(o)+2H2O(o),<br>and also that the saturated solubility of water can be employed as [H2O]o in the adduct formation constants, K(K=[Zn(PTA)2 · phen]o[H2O]o2[Zn(PTA)2 · 2H2O]o-1[phen]o-1). From these results, the equilibrium was explained stoichiometrically, and it was elucidated that the difference in the synergistic extraction among organic solvents is caused by water molecules in the solvents, not by the difference in activity or the different polarities of the organic solvents.

Journal

  • BUNSEKI KAGAKU

    BUNSEKI KAGAKU 50 (7), 487-491, 2001

    The Japan Society for Analytical Chemistry

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